Further observations concerned with auditory fatigue during vocal and nonvocal speech activities.

@article{Luterman1969FurtherOC,
  title={Further observations concerned with auditory fatigue during vocal and nonvocal speech activities.},
  author={B F Luterman and R S Karlovich},
  journal={The Journal of the Acoustical Society of America},
  year={1969},
  volume={46 2},
  pages={403-8}
}